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EDWARD DUNS-00MB, p OF -BOSTON, MASSACHUSETTS.

Letters Patent No. 79,215, dated June 23, 1868; fmtedatecl May 7, 1868.

IMPROVEMENT IN` STEAM-GENERATOES.

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TO ALL TOv WHOM THESE PRESENTS SHALL COME: l

Be it known that I, EDWARD -DUNSCOMB, of Boston, county of Sulolk, Commonwealth of Massachusetts, have invented new and useful Improvements inv Steam-Generators; and herebydeclare the'following to be a full, clear,` and exact description thereof, reference` being'had to the accompanying,drawingsfmakng'part ofthis specicatiou.

The object of the invention isv to utilize the products of combustion, now lost' by escaping into smokedischarge flue, chimney, or stack.

I accomplish this by using a steam-generating vapparatus in connection. with or in addition to the boiler no w used, substantially as hereinafter described ;v or when boilers are not used, by conducting into the generator, from the furnace, stove, or fire-pot, the products of combustion before they pass into the Hue, chimney, or stack, or other ultimate smoke-discharge. v

In the drawings above referred to, A denotes the'external cylindrical shell of the apparatus to contain the water to be converted into steam, and which has within it, as shown in Figure 1 of the drawings, a generator composed of the hollow drum B, and a` kseries of annular disks, a a', &c-., united by a range of vertical pipes, b b, Sto., open at top and bottom, to allow free circulation of water through them.

The lower disk @and each alternate disk above it, are confined tov inner circumference of shell B, soas to make a tightjoint at the point of contact.

The disks aa are smaller in circumference than the disks-ala, so as to leave a space between their outer peripheries and the inner circumference of the shell B, the whole shown in iig. lofJthe drawings.

The largerdisks a a have holes or passages,d,'made in them centrally, for the passage through them of the heated products of combustion. I i

The drum B has a heat-induction pipe, c, at its bottom, to carry in from the furnace, stove, or {irc-pot, the. heated products of combustion, and au ieduction, D, at its top, to carry oif same. I

The steam-conducting or escape-pipe is shown at g, through which steam can be carried into valve-chest and valves of au engine, or conducted to any other desired pla-ce for utilization. ,v Y The apparatus so made is to be situated in a convenient position with respect to the usual boiler, the firea vplace ofthe furnace, or stove, or tire-pot, so as to allow the p'roducts of combustion s'o pass through the pipe c, and intothe lower diska of the series, when these highly-heated products of combustion impinge against the lower surface of disk a, and pass upward through `the opening d into the disk a', and after coursing across its (a) underv surface, escape around its (a/)outer periphery, and rise into the disk-a above iti and in like manner` through; and aroundthe successive disks, until itescapes through the uppermost disk into eduction pipe D, andfthen'ceinto the chimney ofthe furnace, 8vo., Ste., or into the atmosphere. i

Two, orany desirable number of these vsteam-'generators may be. placed, one over the-other, `i n order to completely utilize the products of combustion; also serve to heat water,ito supply hot feed-water to the lower generator or to the'boiler; also to extract dye from ldye-wood chips or dye-wood dust, placed in the cylindrical shell A; also' for chemical results demanding hot water or steam, and for many other useful purposes.

A modification of my iuventionis shown in Figure 3 of the drawings, inwhich the edges of. the disks or dedectorsare united together, and to the inner circumference of the drum B, having ports or-passages f f made through the drum, to allow the circulation of fluid and steam around them. i i

Figurefi is a generator, as before described, but not having the interior arrangements -of deilectors or disks, composed simply of a hollow drum, B, and vertical pipes b b b b, open at top and bottom, to allow free circulation through them of water or other liquid. By this free circulation and consequent agitation is produced quick and rapid vaporization, operated by the pipes c and D, as before described,

v Method of .Feeding Water into S'LeZZA of Generator B also ofF'eedz'ng Heated Water info a Steam-Boiler from A Water is fed into cylindrical' shell A, as commonly practised to feed water into steam-boilers, through pipe P, feedingrryater into cylindrical shell A, to be converted into'steam by heat from generator B.

n P', pipe through which heated water is fed from an upper into a lower cyindrical'shell, A, by any method practisd'to feed Water into steamboilers.

Pv, pipe through which heated Wateris fed from cylindrical shell A into n. steam-boiler, byemployment of any appropriate 'method used to lfeed water into steam-boilers.

By the above description it will be seen that I utilize the products of combustion, which now, by passing into the smokedischargc Hue, arewasted; also utilize much of the direct heat from the fire, not exhausted bythe primary boiler.

O'Zaz'm. I claim a steam-generator, constructed and arranged as shown and described.

Washington; D. c., october a, 1866. v t

' EDWARD DUNscoMD.

Witnesses:

P. E. WILSON, HENRY R. WAL'roN, 

